The instrument I used is 4294A impedance analyzer, I use GPIB-USB to connect the instrument and my computer. When I use the keysight connection expert 2018 to connect 4294A, the software cannot auto-identify this instrument. Furthermore, when I test the VISA address, system returned 'Failed: IDN read failed with status VI_ERROR_TMO' and 'lock for IDN read timed out with status VI_ERROR_TMO'.
But the system can detect USB serial port, and can use interactive IO, but still the same problem, 'VI_ERROR_TMO: A timeout occurred
Visa ErrorCode: 0xBFFF0015 (-1073807339)
! Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index' when I query '*IDN?' .